The thing worth seeing is that in enmity to me, the enemy
destroyed his own self. That is, it was such enmity that in brooding about
my destruction, he accepted his own ruination.

[Or:] God is great-- what a harsh enemy the beloved is to
me! Such that when the Rival
showed enmity toward me, the beloved renounced all relationship with him.
That is, [she reflected,] 'why would he maintain a relationship, even of enmity,
with our enemy?'. (369)

FWP:

In the first line, all we really learn that some kind of
enmity somehow ruined or finished off the Other, and that that enmity involved
'me', the speaker. But was it enmity 'for' me, as the commentators quite plausibly
maintain; or was it enmity 'from' me, in the form of some subtle trap or intrigue
that I had contrived? In Urdu, 'my enmity' [merii dushmanii]
can go either way; for discussion and examples, see {41,6}.

The second line has no explicit subject, which means the
subject is to be understood from the context. Under normal circumstances,
we would carry over the subject from the first line, so that we'd be continuing
to reflect on the situation of the Other. This is what Nazm does. But Bekhud
Mohani inserts a new implied subject for the second line: the beloved. This
could be justified on two grounds: because the Other is already finished off
and done for in the first line, so it doesn't make sense for us to continue
to explore his situation in the second line; or else because the lover's obsession
with the beloved makes her always a hovering, readily available, implied subject.

We're thus left with several possibilities:

=the Other was ruined by his enmity for me-- how remarkable
such a self-destructive degree of enmity is!

=the Other was ruined by his enmity for me-- how remarkably
much the beloved hates me, to punish him for this! (This is Bekhud Mohani's
interpretation, reinforced by Arshi's comparison with {100,1}.)

=the Other was ruined by my enmity for him, that's how effective
an enemy I am! And far more to the point, what a remarkable enemy the
beloved is-- she's ready to turn on any of her lovers at the smallest provocation,
which is how I could manage my trick. (See {42,1},
or even more to the point, {38,1}.)

Undecidable no doubt, but not very profound. The ambiguous
word- and meaning-play with dushmanii and dushman
is sufficient to make the verse clever, but not particularly compelling.